64478665741 has 4 divisors (see below), whose sum is σ = 73689903712. Its totient is φ = 55267427772.

The previous prime is 64478665739. The next prime is 64478665763. The reversal of 64478665741 is 14756687446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64478665741 - 2¹ = 64478665739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64478665721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4605618975 + ... + 4605618988.

It is an arithmetic number, because the mean of its divisors is an integer number (18422475928).

Almost surely, 2^64478665741 is an apocalyptic number.

It is an amenable number.

64478665741 is a deficient number, since it is larger than the sum of its proper divisors (9211237971).

64478665741 is an equidigital number, since it uses as much as digits as its factorization.

64478665741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9211237970.

The product of its digits is 27095040, while the sum is 58.

The spelling of 64478665741 in words is "sixty-four billion, four hundred seventy-eight million, six hundred sixty-five thousand, seven hundred forty-one".